package com.sky.service.impl;

import com.aliyun.oss.common.utils.HttpUtil;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.json.GsonLocalDateTimeTypeAdapter;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;

/**
 * @author 自然醒
 * @version 1.0
 */
@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        // 判断openid是否为空
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户
        User u = userMapper.getByOpenid(openid);
        if(u == null){
            u = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(u);
        }
        return u;
    }

    /**
     * 获取微信openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        log.info("微信登录返回参数：{}",json);
        Gson gson= new GsonBuilder().registerTypeAdapter
                (LocalDateTime.class, new GsonLocalDateTimeTypeAdapter((DateTimeFormatter.ISO_LOCAL_DATE_TIME)))
                .create();
        User user = gson.fromJson(json, User.class);
        String openid = user.getOpenid();
        return openid;
    }
}
